Notices
Stock JK Tech Bulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.

PO420 code

Thread Tools
 
Old Jul 14, 2011 | 04:43 AM
  #1  
tcodtj's Avatar
Thread Starter
JK Enthusiast
 
Joined: Jun 2007
Posts: 184
Likes: 0
From: missouri
Default PO420 code

My jeep cel came on yesterday so I used my flashpaq to check and reset the light. I called the dealer because it is still under federal emissions warrenty.They are ordering a new catalytic converter.Has anyone had this problem. By the way its an 07 with 33000 miles.
Reply
Old Jul 14, 2011 | 11:47 AM
  #2  
Sigman's Avatar
JK Enthusiast
10 Year Member
 
Joined: May 2011
Posts: 304
Likes: 2
From: Bushnell, Fl
Default

Yep had it done at 48,000 have them replace the censors too! All 4 of them.
Reply
Old Jul 14, 2011 | 01:53 PM
  #3  
rodeocln's Avatar
JK Newbie
 
Joined: May 2010
Posts: 47
Likes: 0
From: Simi Valley, Ca
Default

MY check engine light just came on. I don't have a flashpaq. How I check it without going to the dealer. (I hope).
Reply
Old Jul 14, 2011 | 02:06 PM
  #4  
ronjenx's Avatar
JK Jedi Master
15 Year Member
 
Joined: Feb 2008
Posts: 12,904
Likes: 185
From: Maine
Default

Originally Posted by rodeocln
MY check engine light just came on. I don't have a flashpaq. How I check it without going to the dealer. (I hope).
1. To check your Jeep JK Wrangler’s DTC codes, simply insert your key into the ignition, turn it to the ‘ON’ position but do not start the engine. Then, push the key into the ignition cylinder and while holding it in, turn it to the ‘OFF’ position and then back to the ‘ON’ position (3) times straight making sure to end with it in the ‘ON’ position. It is important to keep pushing in on the key to prevent it from catching at the different positions along the way.
2. If you do step #1 correctly, all your dash lights will illuminate and your odometer will show up as a series of (6) dashes. If your Jeep JK Wrangler has logged any DTC’s, they will be displayed soon after the dashes appear. Write down the DTC(s).
3. If your Jeep JK Wrangler has not logged any DTC’s, the dashes on your odometer will be followed by the message ‘-done-’. Turn your key to the ‘OFF’ position and you will in fact be done.
Reply
Old Jul 14, 2011 | 06:38 PM
  #5  
thitalian97's Avatar
JK Enthusiast
 
Joined: Oct 2010
Posts: 174
Likes: 0
From: North Liberty, IA
Default

sure have but i had to jump through way more hoops. first had 2 O2 sensors replaced. then the PCM then the same 2 O2 sensors. then the other 2 O2 sensors before they finally agreed with me that it was the catalytic convertor. $300 and at least 12 days of going with out a jeep over a 9 month period about did me in. glad to hear they went right to yours though. btw i have an 08 with 77k on it
Reply
Old Jul 14, 2011 | 06:46 PM
  #6  
JK-jeepit's Avatar
JK Super Freak
 
Joined: Nov 2010
Posts: 1,307
Likes: 0
From: Alb., NM
Default

Originally Posted by ronjenx
1. To check your Jeep JK Wrangler’s DTC codes, simply insert your key into the ignition, turn it to the ‘ON’ position but do not start the engine. Then, push the key into the ignition cylinder and while holding it in, turn it to the ‘OFF’ position and then back to the ‘ON’ position (3) times straight making sure to end with it in the ‘ON’ position. It is important to keep pushing in on the key to prevent it from catching at the different positions along the way.
2. If you do step #1 correctly, all your dash lights will illuminate and your odometer will show up as a series of (6) dashes. If your Jeep JK Wrangler has logged any DTC’s, they will be displayed soon after the dashes appear. Write down the DTC(s).
3. If your Jeep JK Wrangler has not logged any DTC’s, the dashes on your odometer will be followed by the message ‘-done-’. Turn your key to the ‘OFF’ position and you will in fact be done.
good info thanks for posting this...
Reply
Old Jul 15, 2011 | 05:40 AM
  #7  
tcodtj's Avatar
Thread Starter
JK Enthusiast
 
Joined: Jun 2007
Posts: 184
Likes: 0
From: missouri
Default

They had already changed the 4 o2 sensors and pcm about 1 1/2 year ago so maybe thats why they're going straight to the cats
Reply




All times are GMT -8. The time now is 11:58 PM.